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OPA380: I cannot post a picture, from one moment to the other...

kai klaas69
Guru 140200 points
Part Number: OPA380

Belongs to this thread:

e2e.ti.com/.../opa380-can-opa380-used-to-amplify-the-photodiode-which-is-illuminated-by-a-dc-light

Kai

  • 0
    Prodigy 30 points

    Hi Kai,

    Thanks very much for this informaton. Actually, it does work when amplifying a AC photocurrent now with 10kOhm, 100 kOhm and 1 MOhm, with or without a feedback capacitor. But this is not what I want.

    What I am trying to amplfy is a DC photocurrent. The Phodiode is shined by a light with constant light intensity emitted from a LED.

    I used different constant light intenisties (thus corresponding to different DC photocurrent values), but always get the same voltage output from the TIA.

    That is why I am wondering a DC photocurrent can be amplified by the OPA380 or not. DC means the frequency is 0 Hz.

    Best Regards

    Yuefei

  • +1 in reply to Yuefei Cai
    Guru 140200 points

    Hi Yuefei,

    I understand what you mean. But even if only DC operation is desired, the OPAamp circuit must be designed to work stably. You will not get stable DC performance with an instable design. So please add the phase lead capacitance in the feedback loop and the isolation resistor at the output Relaxed

    Kai